Method and apparatus for selectively presenting weft threads to weft thread inserting means in weaving machines



Nov. 19, 1963 E. PFARRWALLER 3,111,144

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFTTHREAD INSERTING MEANS IN WEAVING MACHINES Filed April 21, 1961 4Sheets-Sheet 1 T' EPW/N Prq Nov. 19, 1963 E. PFARRWALLER 3,111,144

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFTTHREAD INSERTING MEANS IN WEAVING MACHINES Filed April 21, 1961 4Sheets-Sheet 2 Jnvenfor:

Nov. 19, 1963 E. PFARRWALLER 3,

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFTTHREAD INSERTING MEANS IN WEAVING MACHINES Filed April 21, 1961 v 4Sheets-Sheet 3 Fly. 6

5 Fig.7

Jnvenfar:

1963 E. PFARRWALLER 3,111,144

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFTTHREAD INSERTING MEANS IN WEAVING MACHINES File d April 21, 1961 4Sheets-Sheet 4 122112 g 12g; 1 56 12 0 12 4 I 123 124 155 1400' 0 Q;140: 135 m $3? 134 1421/ 7 125 1421,- .2 12g 53 -?T W I 133 a b c a 54 k138 a c b (1}) Jnvenfor:

United States Patent @hice 1 3 ,111,144 Patented Nov. 19, less 3,111,144METHOD AND APPARATUS FOR SELEC- TIVIELY PRESENTHNG WEFT THREADS TB WEFITHREAD INSERHNG MEANS IN WEAVING MAQHlNES Erwin Piarrwaller, Winterthur,Switzerland, assignor to Snlzer Fret-es, .A., Winterthur, Switzerland, acorporation of witzerlantl Filed Apr. 21, 1961, Ser. No. 164,672priority, application Switzerland Apr. 26, 196d 27 Claims. ((31.139-126) The present invention relates to a method and apparatus forsetting, in a loom for weaving, a thread changing mechanism forselectively presenting weft threads to means for inserting the selectedweft threads into a shed formed by warp threads, the mechanism includinglocking means operated by the main drive shaft of the weaving machinefor locking the mechanism in the position for presenting a selected weftthread and for releasing the mechanism after the selected weft threadhas been taken over by the inserting means, for resetting the mechanismin the position for presenting the subsequently to be inserted weftthread.

in the method and apparatus according to the invention the setting ofthe mechanism is effected by one or more elements actuated by a sheddingmechanism, the number of elements depending on the number of differentWeft threads which must be selectively insented. The setting operationis accelerated by accumulating the force provided by the sheddingmechanism during the periods when the thread changing mechanism islocked and by using the accumulated power for performing the opera tionof resetting the thread changing mechanism. In this way not only agreater force is available for the resetting operation but less force ismore steadily drawn from the shedding mechanism and the latter and itsdrive are more equally and continuously stressed and loaded.

in the apparatus according to the invention a force accumulator isinterposed between each element actuated by a shedding mechanism and thethread changing mechanism tor the above described purpose. This forceaccumulator may be a mechanical device using a coil spring as a forceaccumulator which spring is interposed between spring washers which areaxially movable on a rod or pin between abutments thereon. The pin,spring and washer assembly is coaxially placed in an oblong cylinderwhose end walls form abutments for the spring washers. In amodification, the force accumulator is constituted by a fluid underpressure acting between two pistons which replace the spring washers ina device which is otherwise similar to the aforedescribcd mechanicalaccumulator. in yet another modification the power accumulator issubstituted by axially aligned coils producing, if energized by electriccurrent, a magnetic force adapted to pull an armature mounted on a rodcoaxial of and within the coils into a desired position depending onwhich coil is energized. The rod is connected to the thread changingmechanism and the selective energization of the coils is effected byswitches actuated by the elements which are operated by the sheddingmechanism.

if a mechanical or hydraulic force accumulator is used, a motion dampingmeans is preferably interposed or connected to the linkage between thepower accumulator and the thread changing mechanism.

The novel features which are considered characteristic of the inventionare set forth with particularity in the appended claims. The inventionitself, however, and additional objects and advantages thereof will bestbe understood from the following description of embodi- Claims meritsthereof when read in connect-ion with the accompanying drawing, wherein:

F-QG. 1 is a perspective diagrammatic illustration of an apparatusaccording to the invention.

FIG. 2 diagrammatically illustrates four different operating positionsof a mechanism actuated by the apparatus according to the invention forpresenting selected weft threads to weft thread inserting means.

FIG. 3 is a graph showing the action and movements of individual partsof the apparatus according to the invention at different angularpositions of the main drive shaft of the weaving machine.

FIGS. 4 to 7 are longitudinal sectional views of a mechanical forceaccumulator forming part of the apparatus according to the invention, intour different operating positions.

FIG. 8 is a sectional view of a modified motion damping device for usein combination with the apparatus shown in FIG. 1.

PEG. 9 is a longitudinal sectional view of a portion of the device shownin FIG. 8.

FIG. 10 illustrates a modified portion of the apparatus shown in FIG. 1including a hydraulic force-accumulating device which is shown inlongitudinal section.

FIG. 11 is a part sectional view of a modified apparatus according tothe invention including a magnetic device which is used in lieu of thevforce accumulator forming part of the apparatus shown in FIG. 1.

FIG. 12 is a longitudinal sectional view of a portion of a modifiedmechanical force accumulator suitable for use in the apparatus accordingto the invention.

HS. 13 is a cross-sectional view of the force accumulator shown in FIG.12, the section being made along line XlIL-XIII of FIG. 12.

FIG. 14 is a longitudinal sectional view of a portion of a modificationof a force accumulator suitable for use in the apparatus according tothe invention.

FIG. 15 is a crosssectional view of the force accumulator shown in FIG.14, the section being made along line XV-XV of FIG. 14.

Referring more particularly to FIG. 1 of the drawing, numeral 15designates a dobby which may be connected to the frame of a weavingmachine, not shown. The dobby includes a conventional mechanism forselectively actuating elements 16 individually operating .a mechanismfor lifting a heddle frame .17. The dobby also actuates elements and 19which are similar to the elements 16 and which operate a thread changingdevice 21 for selectively presenting weft threads to shuttles 59 whichpick the weft threads in the conventional manner through a shed formedby warp threads.

The elements 18 and 19 are pivotally connected to an arm of angle levers22 and 23, respectively, which swing on a stationary shaft 24 The secondarms of the levers 22 and 23 are pivotally connected to one end of rods26, 27, respectively, whose second ends are pivotally connected to onearm of angle levers 28 and 2.9, respectively, swinging on stationarypins 25. The second arms of the levers 2d and 2 9 are connected to forceaccumulators 30 and 31, respectively, which will be described later.

Pins 32 and 33 extend from the accumulators 3t) and 311, respectively,and are pivoted to the upper arms of three-arm levers 36 and 37,respectively, swingably supported by pins 34. Pins 5% and 41 areconnected to arms 38 and 39 of the levers 36 and 37, respectively, andto the ends 42 and 43, respectively, of a balance beam 35. The fulcrum44 of the latter is connected by a link 45 to a crank 46 connected to ashaft 47 supported by a stationary bearing and rigidly connected to thedevice 2 1. The latter has a circular marginal portion provided withaxial grooves 48a to 48d axially slidably supporting thread presenters49a to 49d, respectively. These thread presenters are pushed in theconventional manner towards the shuttles whenever a thread presenter isplaced in the picking line. Such mechanisms are disclosed in Patent Nos.2,726,685, 2,783,778, 2,796,084, 2,806,687, 2,817,367, 2,865,406.

The device 2 1 includes *a locking segment 51 having recesses 52a. to520. for individually receiving a locking roller 53 at one end of atwo-arm lever 54 swinging on a shaft 55. .The second end of the lever 54is pivotally connected to one end of a rod 56, a pin '57 being connectedto the second end of the rod 56 which pin extends into a cam groove 58in a disc 5-9 mounted on a shaft 61 which is driven synchronously withthe main shaft of the weaving machine, not shown, and makes onerevolution per pick.

The arms 76 and 77 of the levers 36 and 37, respectively, are connectedto damping pistons 78 and 79, respectively, which do not only dampen therocking movement of the levers 36, 37 but are also adapted to stopmovement of the device 21 when it is in a selected position forreceiving the locking roller 53 in one of the recesses or notches 52.

Each of the levers 36 and 37 can assume two different positions so thatthe beam 65 can be placed into four different positions, as shown inFIG. 2.

Since the arm of the beam 35 extending from the fulcrurn 44 to the end43 is twice as long as the arm of the beam extending from the fulcrum44- to the end 42, the fulcrum 44 of the lever or beam 35 can be placedinto two spaced positions b and c by placing the beam into inclinedpositions 35b and 350 and can also be placed into two positions a and dupon placement of the beam into an upper or lower horizontal positionwhereby the distances ab and c-d are equal to the distance bc. Fig. 2separately shows the device 21 in the four positions obtainable byplacing the fulcrum 44 into the four positions a, b, c and d.

FIG. 4 shows the force accumulator 31 which has a casing 65 one end ofwhich is provided with an eye 64- receiving a pin for pivotallyconnecting the casing to the lever 29. The casing 65 accommodates apressure spring 67 between washens 68 and 69 through which extends thepin 33 the end 71 of which is pivotally connected to the lever 37. Thewasher 68 is adapted to abut against a shoulder 73 of the pin 36 and thewasher 6-9 is adapted to abut against a shoulder 72 of the pin 33.Depending upon the relative position of the pin 33 and of the casing 65the washers may also abut the inner end walls of the casing 65. Eachwasher is made in two halves afiordin-g mounting on the thin middleportion of the pin 33. The spring 67 tends to move the washers apart.The length of the relatively thin portion of the pin 33 between theshoulders 72 and 73 is equal to the length of the interior of the casing65.

When the drive shaft of the loom is in the angular position a" (FIG. 3),movement of the heddle frames by the shedding mechanism 15 is initiated.Line A represents the movement of the elements 16, 18 and 19 and of theeye 64 upon rotation of the main drive shaft of the weaving machine.Line B represents the movement of the eye 71 at the end of the pin 33.This eye 71 does not move when movement of the heddle frames beginsbecause the device 21, whose movement is represented by line C, islocked at this time. At the angular position b the eye 64 has movedthrough the distance s (line A) and the washers 68, 69 rest on theshoulders 73 and 72 as well as on the end walls of the interior of thecasing 65. There is no stress on the pin 33. The tension of the spring67 is shown by line D of FIG. 3. The spring has an initial tension PWhen the main drive shaft has reached the angular position the eye 64has moved through the distance S The washer 68 abuts the casing 65 andthe washer 69 rests on the shoulder 72. In this position of the device31 the spring 67 exerts a pressure F on the pin 33 which is equal to thesum of the initial tension P and the pressure produced by the movementof the eye 64.

The eye 64 is moved farther so that the spring 67 is additionallycompressed. This shown in FIG. 5. When the main drive shaft has reachedthe angular position d the lever 54 begins to swing and unlocks thedevice 21 (line C). Unlocking is completed at position 2". The bolt 33and the eye 71 can now move according to line B and the acctunulatedforce P can act on and move the lever 37 in clockwise direction, causinga lifting of the pin 41 and of the end 43 of the beam 35.

The aforesaid movement effects rocking of the device 21 to present aselected weft thread to a shuttle. The accumulated force P acceleratesall elements needed for this operation.

Upon reaching the angular position 1 (line B) the damping apparatusbegins to function. As seen in FIG. 1 the arm 77 of the lever 37 isconnected to the piston 79 reciprocable in a cylinder containing oil ina casing 81. The cylinder communicates with a channel 83 by way of anaperture 82 in the middle of the cylinder and an aperture at the lowerend of the cylinder. When the piston closes the aperture 82 oil fiow isthrottled and the movement of the parts connected to the piston isbraked until the piston reaches the bottom of the casing 81. In thisposition the initial tension P of the spring 67 acts on the pin 33, i.e.the washer 68 does not abut against the casing 65. The notch 52c is nowopposite the roller 53 and the latter can be moved into the notch uponswinging of the lever 54 at the angular position g (line C) so that thedevice 21 is locked.

If, simultaneously with the actuation of the accumulator 3 1, theaccumulator 30 is also actuated, the lever 36 is moved so that thedevice 21 is rocked from position d to position a (FIG. 2).

FIG. 6 shows the position of parts 64 to 71 of the accumulator 31 afterunlocking, rocking and relocking of the device 21. Since thedisplacement x of the eye '71 71 is smaller than the displacement y ofthe eye 64, a force P is exerted on the lever 37 which force equals theinitial tension P plus the force produced by the compression of thespring 67.

If the heddle frames move upwards according to line A, the eye 71 is, atfirst retained in the position shown in FIG. 7. The eye 64 moves upwardswith the casing 65 to the position shown in FIG. 7 and to the left, asseen in FIG. 1. The pin 33 is pulled out of the casing 65 and the washer69 rests on the :casing 65, the washer 68 rests on the shoulder 73 andthe spring 67 is compressed. The pin 33 moves upward from the positionshown in FIG. 7 upon unlocking of the device 211 and the pin 33 and theparts 64 to 71 assume the positions shown in FIG. 4. Due to thedifference between the paths x and y the force P is applied to the pin33.

FIG. 8 shows a modified damping device for damping the movement of thelever 36 swingable on the fulcrum The two arms 38 and 76 of the lever 36are adapted to individually actuate a single-acting damping piston 84,$5, in cylinders 86, 87, respectively, in a casing 88. The pistons arepressed by springs 8% against adjusting screws 96 in the arms 38 and 76.The casing 88 has a cavity 91 filled with oil and laterally connected bybores 92 with the cylinders 66 and 87. The bottoms of the cylinders 86and 87 are provided with oil outlets 93 which are interconnected by achannel 94. Throttle valves 95 are provided at the junction of the bores93 and the channel 94.

The free ends of the piston 84 and are provided with pins 97 having atapered end portion 96, as seen in FIG. 9, for throttling the passage ofoil through the bores 93. The pins 97 are completely inserted in theoutlet bores 93 when the lower ends of the pistons abut against the endwalls 98 of the cylinders. The lever 37 may be pro' vided with twosingle-acting damping pistons in the same manner as is the lever '36shown in FIG. 8.

If the lever 36 swings counterclockwise, the arm 38 to which the pin 40is connected is lifted and lifts the arm 42 of the lever or balance beam35. The arm 76 of the lever 36 pushes the damping piston 85 into thecylinder 87 against the action of the spring 89, driving the oil throughthe bore 92 into the cavity 91. After closing of the bore 92 by thepiston 85 the oil moves through the channel 94 containing the throttlevalves 95 into the space of the cylinder ss below the piston 84. At thebegitming of the counterclockwise movement of the lever 36 the piston 84follows the arm 33 due to the action of the spring 89. It may bepossible that the upward movement of the piston 84 is not as fast as theupward movement of the screw 9% in the arm 38. This does not impairproper operation. The channel 94- is connected by a bore with the cavity91 which bore may be closed by a plug 99 which may be so shaped as toact as a throttle in the channel 94. In this case the throttle valves 95may be omitted.

FIG. illustrates a hydraulic force accumulator comprising a cylinder1111 containing two pistons 1G2 and 163 which are axially movable on apin 11M. Sealing rings are provided inside and outside of each pistonfor sealing the pistons against the pin 104 as well as against theinside of the cylinder 1131. The space 1115 between the pistons isfilled with a fluid, for example, oil. A pressure chamber 107 islaterally connected to the cylinder 101 by means of a channel 166. Thespace 1118 in the pressure chamber 187 not filled by oil is occupied byair or gas under pressure.

The pin 104 is guided to move axially of the cylinder 101 by suitableguides at the ends of the cylinder 161. The pin is provided with annularshoulders 16? and 11th. The axial distance between these shoulders isequal to the distance between the end walls of the cylinder 101. Theshoulders 1119 and 11h serve as abutments for the pistons 1G3 and 1112,respectively. To pennit removal of the pistons from the pin 1tl4 theshoulder 1111 is formed by a sleeve which is screwed onto the free endof the pin 1114. The sleeve extends into an axial guide extension of thecylinder 161 to which the lever 28 is pivotally connected. The end ofthe pin 194 projecting from the right end wall of the cylinder 1111, asseen in FIG. 10 is pivoted to a lever 112 which is rigidly connected toa shaft 113 corresponding to the shaft 47 in FIG. 1 and supporting theweft thread presenting device 114 corresponding to the device 2 1 inFIG. 1. The element 114 is provided with two recesses 115a and 1155 forslidably supporting weft thread presenters, not shown.

With the device shown in FIG. 10 only two different weft threads can beinserted and only two locking notches 11: and 117 we provided. The lever112 has an arm 113 whose end is pointed and is received in a notch on adamping piston 119. The piston 119 is reciprocable in a cylinder formedin a casing 121 provided with a channel 122 communicating with thecylinder through an aperture 124 and at the end walls 121} of thecylinder, :1 throttle device 123 being placed in the channelapproximately halfway between the ends of the cylinder.

The pistons 102 and 1113 abut either against the annular shoulders 11%and 109, respectively, on the pin 1194 and/or against the end walls ofthe cylinder 1111. if a piston is removed from an end wall of thecylinder 101, a force acts on the pin 104 which is equal to the endsurface of the piston times the specific pressure acting in the chamber108.

Since the weft thread changing device 114- has only two positions, onlyone force-accumulating device is required.

The devices 311 and 31 of FIG. 1 may be in the electromagnetic apparatus125 provided with four coils 126a to 126d, as shown in FIG. 11. Thecoils are individually interposed in parallel relation between a line127 and terminals 1280. to 12hr! of a double-throw switch 129 6 whosesecond terminals 130a to 13th! are connected in parallel to a line 131.

Switch elements 132 and 133 are individually operatively connected tothe elements 18 and 19 shown in FIG. 1, the elements 132 and 133replacing the casings 65 of the accumulators shown in FIGS. 1 and 4 to7. The coils 126:: to 126d are placed coaxially and have a commonarmature 134 mounted on a rod 135 which is guided to move axially withinthe coils. One end of the rod 135 is pivotally connected to the free endof a lever 136. The latter is rigidly connected to a shaft 137 whichcarries a locking segment 139 and actuates a thread-changing device 138.The latter is provided with axial grooves 140a to 140d for axiallyguiding thread presenters, not shown. The thread-changing device isshown in the position for presenting a thread carried by the threadpresenter which is in the groove 140b, numeral 141 desighating thepicking line. The locking segment 139 is provided with recesses 142a to142d for receiving a locking roller 143 mounted at the end of a lever 54in the manner shown in FIG. 1.

In the position of the switch elements 132 and 133 shown in FIG. 11 thecoil 12612 is energized and the armature 134 has moved into this coil sothat the groove 1411b of the device 138 is adjacent to the picking line1411.

Upon movement of the element 132 to the right the coil 12612 isdeenergized and the coil 126a. is energized, tending to pull thearmature 134 to the right. No actual movement of the armature and of therod 135, however, can take place because the roller 53 is still in therecess 14212. When the roller 53 has been moved out of the recess 142])by counterclockwise rocking of the lever 54- the thread-changing device138 is free to be rocked and the armature 134 can move into the coil126d, whereby the thread-changing device 138 is moved clockwise untilthe groove 140d is adjacent to the picking line 141.

If the switch element 133 is moved to the left and the element 132 is inthe position shown in FIG. 11, the coil 126a is energized. If bothswitch elements 132 and 133 are moved from the positions shown in FIG.11 to the second position, the coil 1245c is energized. Theelectromagnetic thread-changin'g setting apparatus shown in FIG. 11 andcomprising the four coils 126a to 126d does not require special dampingmeans and abutments for damping and limiting the movement of the rod135.

The devices 31 and 31 of FIG. 1 may be constructed as shown in part inFIGS. 12 and 13. The part not shown in FIGS. 12 and 13 is like the partshown. A bolt 145 is provided with collars 146 which form abutments fortwopiece washers 147, 143 at the ends of a compression spring 67. Thewashers are longitudinally split into the parts 147 and 148, if desired,at a slant with respect to the longitudinal axis of the pin 145, and canbe moved along the pin 145 between the collars 146. The inside end ofthe washers 14-7, 148 is conical and a ring 149 having a correspondingconical bore is slipped over this inside cnd portion. The small diameterof the conical bore of the ring 149 is greater than the diameters of thecollars 146.

A second coil spring 151} is placed coaxially of and inside of the coilspring 68 between the rings 149. The inside ends of the washers 147, 148preferably project beyond the ring 149.

In the modification of the mechanical force-accumulating device shown inpart in FIGS. 14 and 15 the spring washers 151 are provided with radialslots 152 so that they can be moved from the side onto the pin 154whereby the spring 67 is held in compressed position. The slots 152maybe filled with filling pieces 153 to provide a complete annularsurface abutting against the shoulders formed by the collars 146. Thefilling pieces .153 are made fast on the washers by means of a pin 154.The part of the device not shown in FIG. 14 is like the part shown.

While specific embodiments of the invention have been 7' shown anddescnibed, it will be apparent to "hose skilled in the art that variouschanges, modifications, substitutions, additions and omissions may bemade therein with out departing from the spirit and scope of theinvention as set forth in the appended claims.

I claim:

1. A method for setting in a loom for weaving by means of a sheddingapparatus a mechanism for selectively presenting weft threads to meansfor inserting the selected weft threads into a shed formed by warpthreads, the mechanism including means for locking the mechanism whenthe mechanism is set for presenting a selected weft thread and forunlocking the mechanism after the weft thread has been taken over by theinserting means, the method including the steps of temporarilyaccumulating, while the mechanism is locked, the actuating forcefurnished by the shedding mechanism, and of allowing the accumulatedforce to set the mechanism for presenting the subsequent selected weftthread upon unlocking of the mechanism.

2. A method as defined in claim 1 including the step of retardingsetting of the mechanism by the accumulated force upon approaching thenew setting position.

3. A method as defined in claim 1, including the steps of combining twosetting pulses provided by the shedding mechanism for producing a pulsefor setting the mechanism for presenting selected Wef-t threads to theweft inserting means.

4. In a loom for weaving having a shedding apparatus, and a mechanismfor selectively presenting weft threads to means for inserting theselected Weft threads into a shed formed by warp threads, said mechanismincluding means for locking said mechanism in the positions forpresenting selected weft threads to the weft thread inserting means andfor releasing said mechanism for affording setting of the mechanism to aposition for presenting the subsequently to be inserted Weft thread tothe inserting means: actuating means operatively interconnecting saidshedding apparatus and said mechanism for actuating said mechanism bysaid shedding apparatus when said locking means is released, saidactuating means including force accumulating means adapted totemporarily accumulate the force provided by said shedding apparatuswhile said locking means is in locking position and to actuate saidmechanism by the accumulated force upon release of said locking means.

5. In a loom for weaving as defined in claim 4 and wherein said forceaccumulating means includes two oblong, coaxial members havingcoextensive portions and connected to longitudinally move relatively toeach other, one of said members being operatively connected to saidshedding apparatus, the other of said members being operativelyconnected to said mechanism, each of said members having two axiallyspaced abutments, two elements placed in spaced relation between saidabutments and movably connected to said members for movinglongitudinally of said members, and force-accumulating and releasingmeans interposed between said elements and adapted to urge said elementsapart longitudinally of said members and against said abutments.

6. In a loom for weaving according to claim 5 and wherein the distancebetween the abutments of one member is equal to the distance between theabutments of the second member, and the operating stroke of the memberconnected to said shedding apparatus is greater than the operatingstroke of the member connected to said mechanism to retain an initialforce in said force-accumulating means at all operating positions.

7. In a loom for weaving as defined in claim 4 and wherein said forceaccumulating means includes an o'blong casing operatively connected tosaid shedding apparatus, a pin placed within and axially reciprocablelongitudinally of said casing and having an end portion projecting fromsaid casing and being operatively connected to said mechanism, said pinhaving two axially spaced abutments, two elements placed between saidabutments and within said casing movable longitudinally of said pin andof said casing and adapted to individually abut said abutments and theinner end walls of said casing, and force-accumulating and releasingmeans interposed between said elements and adapted to urge said elementsapart axially of said pin and against said abutments and the inner endwalls of said casing.

8. In a doom for weaving as defined in claim 7 and wherein one of saidabutments is removably connected to said pin for affording mounting andremoval of said elements on and from said pin.

9. In a loom for weaving as defined in claim 7 and wherein said forceaccumulating and releasing means is formed by a coil spring placedcoaxially of said pin, and said elements are in the form of washers.

10. in a loom for weaving according to claim 9 and wherein said Washershave radial siots for placing said washers on said pin.

'11. In a loom for weaving according to claim 10, filling members placedin said slots, and means for retaining said filling members in saidslots.

12. In a loom for weaving as defined in claim 9 and wherein said washersare diametrically split.

13. In a loom for Weaving as defined in claim 9 and wherein said springis initially compressed and in uncompressed state longer than thedistance between said washers when said washers abut said abutments.

14. In a loom for weaving according to claim 9 and wherein saidabutments on said pin are in the form of annular shoulders and saidwashers are split into two parts substantially longitudinally of saidpin.

15. In a loom for weaving according to claim 14 and wherein each of saidwashers has a conical extension, a ring having :a conical bore beingslipped over said extension to hold the two parts of the washertogether.

16. In a loom for weaving according to claim 15, a second coil springplaced within the first coil spring and abutting against rings.

17. In a loom for weaving as defined in claim 7 and wherein the interiorof said casing is cylindrical, said elements are in the form of pistonsprovided with sealing means slidingly engaging the inside of said casingand with sealing means slidingly engaging said pin, and saidforceaccumulating and releasing means is formed by a pressurized fluid.

18. In a loom for weaving according to claim 17, an accumulator for thepressurized fluid connected to and communicating with the interior ofsaid casing between said elements.

19. In a loom for weaving having a shedding apparatus, and a mechanismfor selectively presenting weft threads to means for inserting theselected weft threads into a shed formed by warp threads, said mechanismincluding means for locking the mechanism in the positions forpresenting selected weft threads to the weft thread inserting means andfor releasing the mechanism for affording setting of the mechanism to aposition for presenting the subsequent ly to be inserted weft thread tothe inserting means: an adjusting apparatus for setting said mechanismin selected positions to present selected weft threads to said weftthread inserting means, said adjusting apparatus including two actuatingmembers operatively connected to said shedding apparatus for individualactuation thereby, a balance beam, a fulcrum supporting said balancebeam, and two arms extending from said fulcrum, first connecting meansoperatively connecting one of said arms with one of said actuatingmembers, second connecting means operatively connecting the second armwith the second actuating member, means operatively interconnecting saidfulcrum and said mechanism for placing the latter in selected positionsfor presenting selected weft threads to the weft thread inserting meansaccording to the position of said fulcrum, and means interposed in eachof said connecting means for temporarily accumulating 9 the forceprovided by said shedding apparatus while said locking means is in thelocking position and providing the force for actuating said mechanismfor setting the mechanism in a selected position upon release of saidlocking means.

20. In a loom for weaving as defined in claim 19, a motion-damping meansconnected to each of said connecting means between the respectiveforce-accumulating means and the respective arm of said balance beam.

21. In a loom for weaving having a shedding apparatus, and a mechanismfor selectively presenting Weft threads to means for inserting theselected Weft threads into a shed formed by Warp threads, said mechanismincluding means for locking said mechanism in the positions forpresenting selected weft threads to the weft thread inserting means andfor releasing said mechanism for affording setting of the mechanism to aposition for presenting the subsequently to be inserted Weft thread tothe inserting means: actuating means operatively interconnecting saidshedding apparatus and said mechanism for actuating said mechanism bysaid shedding apparatus when said locking means is released, s aidactuating means including force accumulating means adapted totemporarily accumulate the force provided by said shedding apparatusWhile said locking means is in locking position and to actuate saidmechanism by the accumulated force upon release of said locking means,and motion-damping means connected to said actuating means between saidforce-accumulating means and said mechanism, said damping meansincluding stop means for stopping said actuating means in a positioncorresponding to a predetermined position of said mechanism.

22. In a loom 'for Weaving as defined in claim 21 and wherein saiddamping means includes a cylinder having an open end and an end wall, apiston reciprocable in said cylinder, one end of said piston extendingthrough said open end, a fluid in said cylinder, and a throttled conduitconnected to said end Wall and to an intermediate portion of saidcylinder, said stop means being formed by said end Wall Whereagainstsaid piston abuts for stopping said actuating means.

23. In a loom for weaving according to claim 22, a pin extending fromsaid piston towards said end wall, and an aperture in said end wallconnected for fluid flow with said conduit and adapted to receive saidpin for throttling the fluid flow.

24. In a loom for Weaving according to claim 23 and wherein said pin hasa tapered end portion.

25. in a loom for Weaving having a shedding apparatus, and a mechanismfor selectively presenting Weft threads to means for inserting theselected weft threads into a shed formed by Warp threads, said mechanismincluding cans for locking the mechanism in the position for presentingselected Weft threads to the weft thread inserting means and forreleasing the mechanism for affording setting of the mechanism to aposition for presenting the subsequently to be inserted weft thread tothe inserting means: actuating means operatively interconnecting saidshedding apparatus and said mechanism for actuating said mechanism bysaid shedding apparatus when said lockin" means is released, saidactuating means including means adapted to temporarily accumulate theforce provided by said shedding apparatus While said locking means is inlocking position and to actuate said mechanism by the accumulated forceupon release of said locking means, a lever connected to said actuatingmeans between said force-accumulating means and said mechanism, saidlever having two arms, a single-acting damping piston adapted to beabutted by each of said arms, and means for individually resilientlypressing said damping pistons against said arms.

26. in a loom for Weaving as defined in claim 25, a cylinder for each ofsaid pistons, said cylinders having an open end through which therespective piston extends and a closed end, a conduit interconnectingsaid closed ends, a fluid in said cylinders and in said conduit, andthrottle means interposed in said conduit for throttling the fiow of thefiuid between said cylinders.

27. In a loom for Weaving having a shedding apparatus, and a mechanismfor selectively presenting weft threads to means for inserting theselected weft threads into a shed formed by Warp threads, said mechanismincluding means for locking the mechanism in the positions forpresenting selected Weft threads to the weft thread inserting means andfor releasing the mechanism for afi'ording setting of the mechanism to aposition for presenting the subsequently to be inserted weft thread tothe inserting means: actuating means operatively interconnecting saidshedding apparatus and said mechanism for actuating said mechanism bysaid shedding apparatus when said locking means is released, saidactuating means including a plurality of axially aligned electric wirecoils, a rod supported for longitudinal movement and axially extendingthrough said coils, said rod being operatively connected to saidmechanism for actuating the latter, an armature mounted on said rod, andswitch means operatively connected to said shedding mechanism foractuation thereby for energizing a selected one of said coils accordingto the position of said shedding apparatus for pulling said armature andsaid rod by electromagnetic force into positions corresponding to theselected positions of said mechanism.

References Cited in the file of this patent UNITED STATES PATENTS2,160,338 Moessinger May 30, 1939 2,160,339 Moessinger May 30, 19392,783,778 Pfarrwaller Mar. 5, 1957

1. A METHOD FOR SETTING IN A LOOM FOR WEAVING BY MEANS OF A SHEDDINGAPPARATUS A MECHANISM FOR SELECTIVELY PRESENTING WEFT THREADS TO MEANSFOR INSERTING THE SELECTED WEFT THREADS INTO A SHED FORMED BY WARPTHREADS, THE MECHANISM INCLUDING MEANS FOR LOCKING THE MECHANISM WHENTHE MECHANISM IS SET FOR PRESENTING A SELECTED WEFT THREAD AND FORUNLOCKING THE MECHANISM AFTER THE WEFT THREAD HAS BEEN TAKEN OVER BY THEINSERTING MEANS, THE METHOD INCLUDING THE STEPS OF TEMPORARILYACCUMULATING, WHILE THE MECHANISM IS LOCKED, THE ACTUATING FORCEFURNISHED BY THE SHEDDING MECHANISM, AND OF ALLOWING THE ACCUMULATEDFORCE TO SET THE MECHANISM FOR PRESENTING THE SUBSEQUENT SELECTED WEFTTHREAD UPON UNLOCKING OF THE MECHANISM.